A Puzzle of Anand's Repertoire Preparation

In the above puzzle, it is Black to play. The following is the PGN-format game.

[Event "Morelia-Linares"]

[Site "Morelia/Linares MEX/ESP"]

[Date "2008.02.20"]

[EventDate "2008.02.15"]

[Round "5"]

[Result "0-1"]

[White "Peter Leko"]

[Black "Viswanathan Anand"]

[ECO "B90"]

[WhiteElo "2753"]

[BlackElo "2799"]

[PlyCount "90"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. Qd2 Nbd7 9. f3 b5 10. O-O-O Be7 11. Nd5 Bxd5 12. exd5 Nb6 13. Bxb6 Qxb6 14. Na5 Rc8 15. Nc6 Nxd5 16. Nxe7 Nxe7 17. Qxd6 Qxd6 18. Rxd6 Nc6 19. c3 Ke7 20. Rd1 f5 21. Bd3 g6 22. Rhe1 Rhd8 23. Bf1 Rxd1+ 24. Rxd1 Na5 25. a4 Nc4 26. axb5 axb5 27. Rd5 Kf6 28. Rxb5 Ne3 29. Rb6+ Kg5 30. Ba6 Rd8 31. b4 Kf4 32. Rc6 Nxg2 33. b5 Ra8 34. Bb7 Rb8 35. Rc7 Ne1 36. Rxh7 Nxf3 37. c4 e4 38. Kc2 e3 39. Kd3 g5 40. Ke2 Nd4+ 41. Ke1 Rd8 42. Re7 Nc2+ 43. Kf1 Rd1+ 44. Ke2 Rd2+ 45. Kf1 Nd4 0-1